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Cryogenic Milling with the Pin Mill GSM 250

The Pin Mill GSM 250 is a cryogenic grinding system of the highest quality. The milling plant is made of stainless steel. This also applies to the other system periphery such as the cooling screw conveyor, the filter, etc.

Features of the pulverizing mill

Cryogenic grinding: By using liquid nitrogen viscoelastic materials can be grinded

The plant is suitable for smooth fine grinding of critical substances which tend to adhere to surfaces or caking/ adhesion

Various Mill Pins can be used depending on the requirement

By reducing the loss of essential oils with cryogenic grinding an improvement of the flavour can be achieved, in comparison to milling at normal temperature.

Principle of operation

The crushing principle of the Pin Mill is impact crushing, whereby two opposed pin discs rotate at a high peripheral speed. In this case the material impacts on the pins with high speed and is thereby broken into smaller particles. Beyond this, the air turbulence within the pins causes a collision of the particles.
The plant can be run as cryogenic grinding operation or as gas loop operation.

Cryogenic grinding operation:

Liquid nitrogen is injected into the cooling screw conveyor, i.e. the substance is transported by the liquid nitrogen, which cools down the material to its product-specific processing temperature.

Gas loop operation:

Here, the cooling screw conveyor is not supplied with liquid nitrogen, but overlaid with nitrogen gas.

Application areas for Cold Grinding

The following product groups can be milled on our Pin Mill for cryogenic grinding: